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Operating Revenue (Schedule of Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers ) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue | [1] | $ 3,451 | $ 3,179 | $ 10,005 | $ 9,376
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue | [2] | 2,232 | 2,154 | 5,809 | 5,732
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue | [3] | $ 423 | 401 | $ 1,408 | 1,313
Prior to adoption of revised guidance |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Nonregulated |  |  | 380 |  | 1,114
Regulated |  |  | 97 |  | 696
Nonregulated |  |  | 69 |  | 323
Total operating revenue |  |  | 3,179 |  | 9,376
Prior to adoption of revised guidance | Regulated Electric Sales |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 2,108 |  | 5,590
Prior to adoption of revised guidance | Gas Transportation and Storage |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 406 |  | 1,328
Prior to adoption of revised guidance | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 119 |  | 325
Prior to adoption of revised guidance | Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue |  |  | 2,154 |  | 5,732
Prior to adoption of revised guidance | Virginia Electric and Power Company | Regulated Electric Sales |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 2,108 |  | 5,590
Prior to adoption of revised guidance | Virginia Electric and Power Company | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 46 |  | 142
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated |  |  | 12 |  | 59
Nonregulated |  |  | 2 |  | 12
Total operating revenue |  |  | 401 |  | 1,313
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Gas Transportation and Storage |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 324 |  | 1,062
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | $ 63 |  | $ 180
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 18 for amounts attributable to affiliates.
[3] | See Note 18 for amounts attributable to related parties.

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